１　病历患者，男性，３６岁，因反复间断性血便，伴左下腹疼痛１年余而入院。无肝病及家族遗传病史。体检：左下腹轻压痛。常规检查正常。肠系膜上、下动脉选择性造影显示：中结肠动脉及供应左半中结肠动脉升支明显增殖。纤维结肠镜示：距肛门２５ｃｍ以上至脾曲结肠粘膜下血 1 patient records, male, 36 years old, due to repeated intermittent bloody stool, with left lower quadrant pain more than 1 year admitted. No liver disease and family history of disease. Physical examination: left lower quadrant mild tenderness. Routine inspection. The superior mesenteric and inferior arterial selective angiography showed that in the middle of the colonic artery and the left half of the supply, the ascending branch of the colonic artery proliferated significantly. Fiber colonoscopy shows: more than 25cm from the anus to the spleen and colon submucosal blood